The team at NorBAC, led by scientist David Sandström, investigates various biological threats and outbreaks across North America. They tackle issues like a deadly virus, genetically modified organisms, and bioterrorism while navigating personal and professional challenges.

NorBAC continues to confront new scientific mysteries and potential pandemics. The team faces more complex cases involving genetic manipulation, environmental hazards, and emerging diseases, while also dealing with internal conflicts and external pressures.

The stakes are raised as NorBAC encounters increasingly dangerous biological threats and conspiracies. The scientists grapple with ethically challenging situations and personal dilemmas while racing to prevent catastrophic outbreaks and uncover hidden agendas.

In the final season, NorBAC faces its most daunting challenges yet, including drug-resistant infections, mysterious illnesses, and potential global pandemics. The team must confront powerful adversaries and make difficult choices as they strive to protect public health and unravel complex scientific puzzles.